ER-DELAY-02

Features

• PT2399 Delay/Echo
  • The PT2399 is a CMOS single-chip echo processor IC
  • A high sample rate ADC converts the analog data into a bitstream, which is then stored in internal 44Kbit RAM
  • After processing, the bitstream is de-modulated by DAC and lowpass filter
  • The internal VCO clock frequency determines the overall delay duration
  • The user can easily modify the VCO frequency by changing the external resistance
• Design based on Benjie MiniDelay
• Eurorack 3U, 6HP card
• Built on ER-PROTO-02 card
• Input attenuator, output amplifier
• PT2399 has a maximum current of 30mA
• Jacks
  • J5 IN
  • J6 OUT
• Controls
  • RV1 - Time
  • RV2 - Reps
  • RV3 - Level
• 10 pin Eurorack power jack
  • Uses +12V only

Design

• ER-PROTO-02 card set
  • Front Panel
  • Controls Card
  • Daughtercard

Daughtercard Prototyping Area

U2 - PT2399 Delay IC

U1 - Input Attenuator / Output Amplifier

J8 - Pots connector on Daughtercard

J7 - Jacks connector on Daughtercard

J9/J15 - Power connector on Daughtercard

U3 - 5V Power Regulator

Schematic

• Schematic

Card Build

• Controls card rear

• Partly built

• PT2399 Pin 1 on bottom left

• Daughtercard

• Back of daughtercard

• Card Stackup

• Front view

Measurements

• Bass Drum echo

• Both Mix/Length knobs full CCW

• All (4) drum triggers on IN

Reference

• Benjie MiniDelay
• Little Angel Chorus
• Avoiding Op-Amp Instability Problems In Single-Supply Applications
• PT2399 Dev Delay Assembly Instructions
• PT2399 Dev Delay BOM
• PT2399 Dev Delay PCB
• HAGIWO PT2399 clock sync delay
• PT2399 Analysis bu Electrosmash
• Useful design equations for the PT2399
• MFOS ECHOFXXX
• Valve Wizard Additional notes
• schmitzbits PT2399 based Delay
• benjiaomodular MiniDelay